Improvement in lamps



-C. W. CA'HOON.

Lamp Chimney Holder.

Patented Sept. 16., A186.2.

UNITED STATES PATENT OFFICE.

CHARLES W. CAHOON, OF PORTLAND, MAINE.

i IMPROVEMENT IN LAMPS.

Specilcation forming part of Letters Patent No. 36,451, datcd September16, 1862.

To all whom it may concern:

Beit known that I, CHARLEs W. CAHooN, oi Portland, in the county ofCumberland and State of Maine, have invented certain new and usefulImprovements in the Construction of Lamps; and I do hereby declare thatthe following is a full, clear, and exact description of my saidinvention, reference being had to the accompanying drawings, in which-Figure l represents a side elevation of a lamp embodying my invention.Fig. 2 represents a vertical section of the same. Fig. 3 represents aplan of the grooved clamp-support, and Fig. 4 represents a verticalsection of thegrooved clamp-support at the line x w of Fig. 3.

In a previous 'patent granted to me I described the combination of avibratable chimney-holder fitted with chimney-fastenings and aclamp-support, by means of which combination a vibratable chimney-holderfitted with chimney-fasteni-ngs for securing an independent glasschimney can be attached to a lamp. This combination is now known in themarket as Cahoons attachment for kerosene-lamps,77 and the inventionwhich is the subject-matter of this patent is an improvement in theclampsupport and its combination with the lamp.

The lamp heads or burners,7 as they are sometimes called, ofkerosene-lamps are frequently made with a projecting rim, and the objectof the first part of my invention is to take advantage of this rim insecuring the clamp-support. To this end thispart of my inventionconsists in a grooved clamp-support for the chimney-holder of a lamp,the construction of the clamp support being such that When it is appliedto the rim of the llamp-head and clamped fast thereto the mutualengagement of the rim and groove prevents the upward or downwardmovement of the support without other means of fastening than theclamping of the clamp-support.

The second part of my invention consists in the combination of the saidgrooved clampsupport with the lamphead.

The lamp-head A of the lamp represented in the accompanying drawings isconstructed to screw into the collar at the neck of the lamp-body B, andit has a projecting rim, e, to which thegrooved clampsupport C isapplied. This clamp-support has the form of an open ring with an arm, d,to hold the pivot of a vibratable chimney-holder, E. It is fitted with aclampscrew, f, by screwing which the ring can be tightened so as toclamp the whole fast to the rim of the lamp-head, and the interior ofthe ring part is grooved, as shown in section at a, Fig. 4. Hence,whenthe clamp support is applied to the rim of the lamphead and theclamp-screw is tightened, the engagement of the rim of the lamp-head inthe groove of the support prevents the movement of the clamp-supportupward or downward upon the lamp-head.

The above-described construction may be varied without changing theinvention, substantially, by transposing the rim Yand the groove, makingthe former on the ring of the clamp-support and the latter on thelamphead. A rimmed clamp-support becomes in this manner the equivalentof a grooved clampsupport for the useful results which are obtained bythis construction of the clamp-support.

The vibratable chimney-holder, that is represented as combined with theclamp-support in the accompanying drawings, is fitted with athumb-plate, h, which should be in a convenient position to be operatedby the thumb when the hand is applied to the lamp-handle J. Hence, whenapplying this form of lamp attachmentto a handled lamp, the clamp-screwf should not be tightened until the lamp-head is screwed fast and thethumb-plate h is placed in the right position over the lamp-handle J.When once adjusted to this position and clamped, the thumb-plate willalways be returned to this position by screwing the lamphead into placeafter it has been unscrewed.

I do not claim in this patent the combination of a vibratablechimneyholder with, a clampsuppornor the application of this combinationto the burner of alamp, -as both these are described in a precedingpatent granted to me; but

What I claim as my invention in this patent is 1. A grooved clampsupport for a vibratable chimney-holder, substantiallyas set forth.

2. The combination of a grooved clampsupport With a rimmed lamp-head,substantially as set forth.

In testimony whereoi` I have hereunto set my hand this 6th day ofAugust, 1862.

CHAS. YW. CAHOON.

Witnesses: l

J. S. HAMLEN, .T r., F. l?. BAILEY.

